TOKEN :
{
  < EVALUATE: "evaluate" >
| < EXISTS: "exists" >
| < FROM: "from" >
| < GROUPBY: "groupby" >
| < HASHER: "hasher" >
| < INSERT: "insert" >
| < MODIFY: "modify" >
| < NOT: "not" >
| < PRIORITY: "priority" >
| < METHOD: "method" >
| < RULE: "rule" >
| < RULESET: "ruleset" >
| < SELECT: "select" >
| < SIGNATURE: "signature" >
| < UPDATE: "update" >
| < REFRESH: "refresh" >
| < RETRACT: "retract" >
| < WHERE: "where" >
| < MATCH: "match" >
}